John w



J. W.- BOOH.

HIGH POTENTIAL INSULATOR.

(No Model.)

N0. 601,195. Patented Mar. 22,1898.

W ll a vb v M 7 n INVENTOR om BY- W MW ATTORNEYS.

WIT SSES:

'd-cd/wfir 1 UNITED STATES PATENT OFFICE.

JOHN W. BOOH, OF EAST LIVERPOOL, OHIO, ASSIGNOR TO THE It. THOMAS & SONSCOMPANY, OF SAME PLACE.

HlGH-POTENTEAL lNSULATOR.

SPECIFICATION forming part of Letters Patent No. 601,195, dated March22, 1898.

Application filed February 1, 1898. Serial No. 668,770. (No model.)

To all whom it may concern: the parts may be secured together in otherBe it known that I, JOHN \V. BOG-H, a citizen ways, as by sulfur orother cement after they of the United States of America, residing inhave been separately vitrified and glazed, if East Liverpool, Columbianacounty, State of of porcelain, or molded, if of glass.

Ohio, have invented an Improved High-Po In the construction shown inFig. 1 the tutential Insulator, of which the following is a bularsupporting-post P is shown as made in specification. one with thecentral part A of the body of The object of my invention is to produce athe insulator. The tubular post may, howstrong and effective insulatorfor high-potenever, be made separate from the body parts, 1o tialelectric-transmission lines, and one which as illustrated in Fig. 2,where the centralbody will not only offer high resistance to leakagepart A is shown as having a central opening of current through the bodyof the insulator, a (screw-threaded in thisinstance) for the inbut alsowill prevent arcing of the current sertion of the upper end of thesupportingfrom the edges of the petticoats of the insupost P. Thissupporting-post and central 15 lator during wet weather, and moreparticupart may be secured together by any suitable larly to the metalpin which binds the insumeansas, for instance, by glaze in the courselator to the supporting-arm. This object I of manufacture, it the partsare to be of porattain by mounting the petticoat-body of the 'celain, orafter manufacture by sulfur cement insulator upon an insulating-post,preferably or otherwise. The post may be made out of 20 of the samematerial as the body, and which two molded tubes 13 19, one fittedwithin the passes down through an openingin the wooden other and securedtogether by an intervening cross-arm or support, the metal fastening-pintubular layer of glaze, as indicated at g in being secured in the post.Fig. 1.

In the accompanying drawings, Figure 1 is In any construction describedthe support- 2 5 a vertical sectional view of one form of my ing-post Por P is at its lower end adapted high-potential insulator, and Fig. 2 isacorreto enter an opening made in the wooden or sponding view of amodification. other cross-arm O (shown by dotted lines) and I prefer touse porcelain in the construction an annular shoulder s is formed on thepost of my insulator, both for the body of the into rest on thecross-arm and form a point of o sulator and for the tubular post; butglass or support.

other suitable like or equivalent material may The Vertical opening inthe support P or P be used for either or both parts. I prefer to is of adiameter suitable to receive the iron make the petticoat-body in two ormore parts. or other metal securing-pin R, which is indi- In thedrawings I have shown two petticoats cated by dotted lines and whichextends up 8 5 5 13 I3, each pet-ticoat part being like an ininto thepost to any desired height and is severted bowl, with the smaller onenested into cured by a suitable cementing composition. the larger one.At the top of the outer bowl A nut 72 and a washer w (indicated bydotted there is a head Z) with a central cross-notch lines) complete themeans for securing the b for the electric conductor and side grooveswhole in place on the crossarm. In Fig. 1 o 40 d for the wire by whichthe conductoris to be the securing-pin is shown as having a polygohelddown. The central part A of the body nal head, while in Fig. 2 the pinis shown as of the insulator constitutes in this case a notched to get ahold in the cement. third part of the insulator. These three parts, Inthe described construction it will be seen if of porcelain, may besecured together either that the pin R is so well protected by the tu- 545 during the process of vitrifaction or in the bular post which sheathsit and passes down glazing (if that is done separately from the throughthe cross-arm that leakage of current vitrifaction) in order to make ineffect asingle or arcing across from the edges of the pettihomogeneouspiece. I prefer the method decoat to the pin (liable to occur onhigh-potenscribed in my application Serial No. 656,155, tial circuits ofpresent construction) is here 50 whereby the parts become united withlayers obviated. The exposed end of the pin and of glaze between theconductor and pin; but its nut and washer on the under side of the inthe notch b to give trouble.

I claim as my invention 1. A high-potential petticoat insulator having aVertical tubular post of porcelain or equivalent material, secured toand supporting the petticoats of the insulator and having its lower endadapted to fit into an opening in the cross-arm and a metalfastening-pin in the said tubular post, substantially as described.

2. A high-potential insulator having a supporting-post made in one witha part of the body of the insulator, said supporting-post having itslower end adapted to fit into an opening in the cross-arm, with afasteningpin secured in the post, substantially as described.

3. A high potential porcelain insulator formed of parts united togetherand comprising a body part with one or more petticoats and asupporting-post all of porcelain united together, the lower end of thesupporting-post being adapted to fit into an opening in the cross-arm toreceive a securing-pin from the under side, substantially as described.

4:. A high potential porcelain insulator formed of parts united byintermediate layers of glaze and comprising a body part with one or morepetticoats and a supportingpost whose lower end is adapted to fit intoan opening in the cross-arm to receive a securing-pin from the underside, substantially as described.

5. Ahigh-potential porcelain insulatorhaving a supporting-post made oftwo tubes, one fitted within the other with an intermediate tubularlayer of glaze, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN lV. BOCII. lVitnesses:

L. M. THOMAS, JOHN TAYLOR.

